There's a pretty good weather page on WASR's web site, including a long-range forecast from the National Weather Service for the Lakes Region. According to the NWS forecast, the high temps. in Wolfeboro are supposed to be 27 today, 35 on Tue, 31 on Wed, 27 on Thu, and 30 on Fri.
The URL is
http://www.wasr.net/
On the home page, click on the "Weather" tab. You can then click on various sections of the lake for local long-range forecasts.